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2018 WAEC Biology Theory a. Explain briefly the following terms: i. gene; ii. Hybrid; iii. Trait. (b) Two heterozygous...

Biology
WAEC 2018

a. Explain briefly the following terms:
i. gene;
ii. Hybrid;
iii. Trait.

(b) Two heterozygous yellow flowers are crossed. Using a genetic diagram, state the phenotypic and genotypic ratios of the first filial generation.

(c) State four transmitted characters in plants. 
 

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Explanation

(a) Explanation of terms  
(i) Gene; Is a unit of heredity/genetic material; composed of DNA; located on the chromosome.

(ii) Hybrid  Is an offspring; formed from a cross between parents that are genetically different but of same species.

(iii) Trait  Is a feature/character; that is possessed by an organism; and can be transferred from parents to offspring. 

(b) 


(c) Transmittable characters in plants

  • Type of seed
  • Size of fruit
  • Colour of flower
  • Colour of leaf
  • Height of plant
  • Texture of seed coat
  • Size of plant
  • Leaf shape
  • Any correctly named transmittable character 

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